We experimentally demonstrate the principle of an on-chip submillimeter wave filter bank spectrometer, using superconducting microresonators as narrow band-separation filters. The filters are made NbTiN/SiNx/NbTiN microstrip line resonators, which have a resonance frequency in range 614-685 GHz, two orders magnitude higher than what is currently studied for use circuit quantum electrodynamics and photodetectors. resolution decreases from 350 to 140 with increasing frequency, most likely...

Distant, dusty and extremely luminous galaxies form a key component of the high redshift universe, tracing period intense cosmic activity that ultimately gave rise to present-day universe. These highly galaxies, first detected in ground-based submillimeter region, are however optically very faint, which hampers identification optical counterpart measurement redshift. We developing new direct-detection submm spectrograph DESHIMA. By taking advantage rapidly advancing technology...

Superconducting materials are known to exhibit nonlinear effects and produce harmonic generation intermodulation distortion in superconductive circuits. In planar structures, these nonlinearities depend on the current distribution strip which is mainly determined by structure of device. This paper investigates at step-in-width discontinuity superconducting microstrip transmission lines, computed a numerical approach based 3-D finite-element method. used obtain parameters circuit model for...

This paper introduces a new absorber that can effectively absorb millimeter wave frequencies. The design involves stacking foam, plasma, and laminated graphene sheets on perfect electric conductor substrate. generate wideband effect electromagnetic waves by combining layers plasma medium. absorption bandwidth of the slab depend various parameters like frequency, collisional rate, thickness. By tuning frequency ωp (rad/s), average collision υp(Hz), Fermi energy sheets, thickness foam layers,...

Superconducting materials are known to produce intermodulation distortion and other non‐linear effects. In microstrip structures, the non‐linearity depends on current distribution strip which is mainly determined by geometrical structure of device. The in superconducting parallel‐coupled lines computed a numerical approach based three‐dimensional finite element method. This used circuit model for lines. A technique harmonic balance analysis proposed equivalent circuit. To validate accuracy...

In the present work, a non‐linear distributed circuit model for superconducting rectangular‐spiral resonators is proposed. This based on an accurate parallel coupled lines, which simultaneously considered both quadratic and modulus dependencies. The non‐linearity in devices depends current distribution, mainly determined by geometrical structure of device. distribution spiral can be computed numerical approach three‐dimensional finite element method. used to produce resonator. Numerical...

The non‐linear behaviour of the superconducting microstrip open‐ring resonators is computed by an analytical method based on distributed equivalent circuit model transmission lines. In fact, resonator analysed and relative non‐linearities such as third‐order harmonic generation inter‐modulation (IMD3) distortion, are balance approach. As example, applied to a its IMD3 obtained compared with experiment validate accuracy proposed method. Such approach can considerably save time, cost memory...

In this study, an equivalent linear and non‐linear circuit model of superconducting microstrip T‐junction (SMT) structures is proposed. Two types SMT are analysed using suggested their scattering behaviour compared both the method moment finite‐element (FEM). The fundamental third‐order harmonic outputs obtained balance to observe in structures. A for enhanced also verified by S ‐parameters comparison between FEM method. non‐linearity modelled similarly with results normal

Abstract Quarter-wavelength superconducting spiral resonators have been used to realize a coplanar waveguide bandpass filter and bandstop around the center frequency of 6 GHz. These compact filters made from 300-nm-thick NbTiN thin film on 525-μm-thick silicon substrate. The is six-pole Chebyshev with two zero transmissions due nonadjacent coupling in its structure. Accurately microfabricated air-bridges suppress undesired slot-line mode this filter. very simple two-pole structure that wire...

The Telegrapher's equations for a general nonuniform transmission line (NUTL) is analytically solved when the nonuniformities are of sub-wavelength scale. proposed solution based on an approximation chronological ordering operator in arbitrary NUTL. quite accurate has nonuniformities. scale nonuniformity assessed by using concept minimum resolvable length (MRLN), which physically intuitive idea that electromagnetic waves not affected spectrally mild MRLN inferred spatial Fourier transform...

A distributed circuit model for different kinds of discontinuities in high temperature superconducting (HTS) microstrip transmission lines (TLs), is proposed. In each case, closed form formula lumped element presented based on the configuration discontinuity and characterizations HTS TLs. These consist steps width, open ends, gaps 90-degree bends. case normal conductor TLs there are a lot numerical analytical equations that can accurately them, however those formulas not efficient Thus...

There are non‐linear behaviours in superconductive circuits such as superconducting metamaterial filter. In this study, the authors propose a distributed equivalent circuit model for filter based on stepped impedance resonator. This can be used to predict like third‐order intermodulation distortion and harmonic generation. proposed model, have an accurate prediction, considered both quadratic modulus non‐linearity dependence current. Thereafter, analyses non‐linearly using balance (HB)...

Abstract Microwave filters have successfully been miniaturized using spiral resonators. One of the typical problems in wideband microwave filters, such as is need for very small gaps between resonators to accomplish high external and internal coupling. These cause difficulties physical implementation filter, especially at frequencies. To avoid this problem enable easy fabrication a rectangular microstrip patch was used coupling capacitor instead This technique both filter. Additionally,...

In this paper, the nonlinearity in superconducting coplanar waveguides (SCPWs) with step width discontinuities has been analyzed using a distributed nonlinear circuit model. such structures, nonlinearities depend on current distribution of central strip SCPW. A numerical electromagnetics approach based method moments, which analyzes high-frequency planar circuits, determines distribution. This is used to obtain elements discontinued SCPW structure. The equivalent model can be solved harmonic...

In this paper, non-linear circuit models of the superconducting CPW (SCOW) open-ends and gaps are presented. The model can be used to create a fast accurate analysis nonlinearity in SCOW applications such as end-coupled filters, which have gap open-end discontinuities. is solved using harmonic balance (HOB) method compute third-order intermodulation (IMD3) distortion fundamental outputs. As an example, we analyze band pass filter (BP) validate model. minimize structures via optimizing...

Superconducting devices are known to indicate nonlinear behaviors such as harmonic generation and intermodulation distortion even at low input powers. In this paper, a equivalent circuit model for superconducting interdigital capacitor (SIDC) is proposed. A numerical approach based on 3-D finite-element method used compute the current distribution in SIDCs. Then, closed-form expressions kinetic inductance, resistance, geometrical factor of SIDCs The proposed can be analyzed nonlinearly by...

This article is focused on the design and development of superconducting Microwave Kinetic Inductance Detector (MKID) which used at near, mid far-infrared, optical ultraviolet wavelengths for astronomical applications. MKIDs are micro-resonators very much considered, due to high sensitivity, simplicity in fabrication ease read out by a coplanar waveguide or microstrip transmission line. Here new structure inductor lumped element microwave resonator proposed that causes Quality factor smaller...